Sarah Vania, the organization’s regional HR director, says that Emily’s letters caught her attention, especially because they included several video links that showed the results of Emily’s advocacy and fundraising work at other organizations. Emily explains, “I had prior experience advocating for former child soldiers, human trafficking survivors, vulnerable women, and displaced persons. It’s one thing to make statements in a cover letter, like ‘I can make a pitch, I am a creative person, I am thoughtful,’ but showing these qualities seemed like a better way of convincing the recruiter that the statements were true.”
One of the most common mistakes people make in any kind of writing is that they tell their audience what they want them to know. Just as you'll generally find explanations to be dull in a film, your prospective employer will find them to be dull in a cover letter. There's no sense in telling anyone that you're a hard worker or a team player because you'll be 1) expecting that they'll trust such a generic statement and 2) among many other undesirable candidates who write the same thing. If you're going to provide reasons why you're great, provide an undeniable example instead.